Can I re-enter using my I-551 stamp??

[T-Rex]

I am planning to travel abroad next month for about a month, alongwith my wife and child. Can we re-enter using our I-551 stamp. Do I need to carry any other documents with me. I do not have a plastic card as my I-485 just got approved (EB case). Any other thing I need to keep in mind before I travel ??

Appreciate your comments.

Thanks.